On the absence of bipolarons in manganese perovskites

M. Chipara, R. Skomski, Sy-Hwang Liou, P. A. Dowben, S. Adenwalla

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The paramagnetic phase of La0.65Ca0.35MnO3 and La0.65Pb0.35MnO3 powders was investigated by electron spin resonance. The resonance spectra, for a range of temperatures, was used to examine the presence of polarons and bipolarons. The resonance lines are compatible with the presence of polarons (g ≈ 2), but the characteristic high-spin bipolaron lines (g ≈ 4) are absent. The results are inconsistent with the presence of high-spin bipolarons. The evidence with respect to low-spin bipolarons is less conclusive, although the temperature dependence of the resonance line parameters speaks against the presence of low-spin bipolarons.

Original languageEnglish (US)
Pages (from-to)297-301
Number of pages5
JournalMaterials Letters
Volume59
Issue number2-3
DOIs
StatePublished - Feb 1 2005

Fingerprint

perovskites
Manganese
manganese
Polarons
polarons
resonance lines
Powders
Paramagnetic resonance
Temperature
electron paramagnetic resonance
temperature dependence
temperature

Keywords

  • Electron spin resonance
  • Electronic materials
  • Manganese perovskites
  • Polaron/bipolaron

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Chipara, M., Skomski, R., Liou, S-H., Dowben, P. A., & Adenwalla, S. (2005). On the absence of bipolarons in manganese perovskites. Materials Letters, 59(2-3), 297-301. https://doi.org/10.1016/j.matlet.2004.10.007

On the absence of bipolarons in manganese perovskites. / Chipara, M.; Skomski, R.; Liou, Sy-Hwang; Dowben, P. A.; Adenwalla, S.

In: Materials Letters, Vol. 59, No. 2-3, 01.02.2005, p. 297-301.

Research output: Contribution to journalArticle

Chipara, M, Skomski, R, Liou, S-H, Dowben, PA & Adenwalla, S 2005, 'On the absence of bipolarons in manganese perovskites', Materials Letters, vol. 59, no. 2-3, pp. 297-301. https://doi.org/10.1016/j.matlet.2004.10.007
Chipara, M. ; Skomski, R. ; Liou, Sy-Hwang ; Dowben, P. A. ; Adenwalla, S. / On the absence of bipolarons in manganese perovskites. In: Materials Letters. 2005 ; Vol. 59, No. 2-3. pp. 297-301.
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abstract = "The paramagnetic phase of La0.65Ca0.35MnO3 and La0.65Pb0.35MnO3 powders was investigated by electron spin resonance. The resonance spectra, for a range of temperatures, was used to examine the presence of polarons and bipolarons. The resonance lines are compatible with the presence of polarons (g ≈ 2), but the characteristic high-spin bipolaron lines (g ≈ 4) are absent. The results are inconsistent with the presence of high-spin bipolarons. The evidence with respect to low-spin bipolarons is less conclusive, although the temperature dependence of the resonance line parameters speaks against the presence of low-spin bipolarons.",
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AU - Adenwalla, S.

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AB - The paramagnetic phase of La0.65Ca0.35MnO3 and La0.65Pb0.35MnO3 powders was investigated by electron spin resonance. The resonance spectra, for a range of temperatures, was used to examine the presence of polarons and bipolarons. The resonance lines are compatible with the presence of polarons (g ≈ 2), but the characteristic high-spin bipolaron lines (g ≈ 4) are absent. The results are inconsistent with the presence of high-spin bipolarons. The evidence with respect to low-spin bipolarons is less conclusive, although the temperature dependence of the resonance line parameters speaks against the presence of low-spin bipolarons.

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